"How to say 'in the morning' in English?"
This is a simple question with a straightforward answer. In English, you would say "in the morning" to refer to the time period between midnight and noon. Here is a short and concise way to express this:
"In the morning" can be said as "in the am" or "in the morning hours."
So, if someone asks you, "What time is it in the morning?", you would simply reply with "It's in the morning hours/am."